netdev - Re: [bpf-next V1 PATCH 09/15] mlx5: register a memory model when XDP is enabled

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Message-ID: <9b24bef5-844e-6ff9-ed66-1e04fe0fac9c@mellanox.com>
Date:   Wed, 7 Mar 2018 13:50:19 +0200
From:   Tariq Toukan <tariqt@...lanox.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>, netdev@...r.kernel.org,
        BjörnTöpel <bjorn.topel@...el.com>,
        magnus.karlsson@...el.com
Cc:     eugenia@...lanox.com, Jason Wang <jasowang@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>, galp@...lanox.com,
        Daniel Borkmann <borkmann@...earbox.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Tariq Toukan <tariqt@...lanox.com>
Subject: Re: [bpf-next V1 PATCH 09/15] mlx5: register a memory model when XDP
 is enabled



On 06/03/2018 11:48 PM, Jesper Dangaard Brouer wrote:
> Now all the users of ndo_xdp_xmit have been converted to use xdp_return_frame.
> This enable a different memory model, thus activating another code path
> in the xdp_return_frame API.
> 
> Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>
> ---
>   drivers/net/ethernet/mellanox/mlx5/core/en_main.c |    7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> index da94c8cba5ee..51482943c583 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> @@ -506,6 +506,13 @@ static int mlx5e_alloc_rq(struct mlx5e_channel *c,
>   		rq->mkey_be = c->mkey_be;
>   	}
>   
> +	/* This must only be activate for order-0 pages */
> +	if (rq->xdp_prog)
> +		err = xdp_rxq_info_reg_mem_model(&rq->xdp_rxq,
> +						 MEM_TYPE_PAGE_ORDER0, NULL);
> +	if (err < 0)
> +		goto err_rq_wq_destroy;
> +

Use "if (err)" here, instead of changing this in next patch.
Also, get it into the "if (rq->xdp_prog)" block.


>   	for (i = 0; i < wq_sz; i++) {
>   		struct mlx5e_rx_wqe *wqe = mlx5_wq_ll_get_wqe(&rq->wq, i);
>   
>